nanog mailing list archives
Re: Filter NTP traffic by packet size?
From: Frank Habicht <geier () geier ne tz>
Date: Thu, 27 Feb 2014 08:46:48 +0300
On 2/27/2014 8:09 AM, Randy Bush wrote:
I only ran the scan once, but had ~130k devices respond.is there any modern utility in chargen?
I know of none, maybe I'm too young. So we could conclude we don't need that service running. But some folk use ports for services other than the intended - like tcp:443 for VPN ;-) So if we can get enough abusable end-systems fixed (hope so *), and we get enough source address validation (bcp38) to reduce sources of badness (hope so *), then the network won't need to block that port and someone can make inventive use of it ;-) (*) and working on it. Frank PS: - seems something going on already, had one outside complain about traffic from our IP udp:19 - better start scanning proactively
Current thread:
- Managing ACL exceptions (was Re: Filter NTP traffic by packet size?), (continued)
- Managing ACL exceptions (was Re: Filter NTP traffic by packet size?) Jay Ashworth (Feb 26)
- Re: Managing ACL exceptions (was Re: Filter NTP traffic by packet size?) Keegan Holley (Feb 27)
- Re: Managing ACL exceptions (was Re: Filter NTP traffic by packet size?) Ray Soucy (Feb 28)
- Re: Managing ACL exceptions (was Re: Filter NTP traffic by packet size?) Jay Ashworth (Feb 28)
- Re: Managing ACL exceptions (was Re: Filter NTP traffic by packet size?) Ray Soucy (Feb 28)
- Re: Managing ACL exceptions (was Re: Filter NTP traffic by packet size?) Jay Ashworth (Feb 28)
- Re: Managing ACL exceptions (was Re: Filter NTP traffic by packet size?) Christopher Morrow (Feb 28)
- Re: Filter NTP traffic by packet size? Valdis . Kletnieks (Feb 26)
- Re: Filter NTP traffic by packet size? Jared Mauch (Feb 26)
- Re: Filter NTP traffic by packet size? Randy Bush (Feb 26)
- Re: Filter NTP traffic by packet size? Frank Habicht (Feb 26)
- Re: Filter NTP traffic by packet size? Jimmy Hess (Feb 26)
- Re: Filter NTP traffic by packet size? Niels Bakker (Feb 28)
- Re: Filter NTP traffic by packet size? Randy Bush (Feb 28)
- Re: Filter NTP traffic by packet size? Niels Bakker (Feb 28)
- Re: Filter NTP traffic by packet size? Robert Drake (Feb 26)
- Re: Filter NTP traffic by packet size? Keegan Holley (Feb 27)
- Re: Filter NTP traffic by packet size? Jimmy Hess (Feb 26)
- Re: Filter NTP traffic by packet size? Robert Drake (Feb 26)
- Re: Filter NTP traffic by packet size? Cb B (Feb 25)
- Re: Filter on IXP Jérôme Nicolle (Feb 28)